john zarrella, cnn, miami. >>> >>> when barack obama was elected in 2008, he was called the facebook president. in 2012, everyone's using social media, we'll look at how social media might make the difference come election day. ♪ ♪ [ male announcer ] how do you engineer a true automotive breakthrough? ♪ you give it bold new styling, unsurpassed luxury and nearly 1,000 improvements. introducing the redesigned 2013 glk. see your authorized mercedes-benz dealer for exceptional offers through mercedes-benz financial services. through mercedes-benz why they're always there to talk. i love you, james. don't you love me? i'm a robot. i know. i know you're a robot! but there's more in you than just circuits and wires! uhhh. (cries) a machine can't give you what a person can. that's why ally has knowledgeable people there for you, night and day. ally bank. your money needs an ally. >>> we're taking a look at the big issues this election and if you want to know what the candidates are promising to do. we actually have some tools for you to use. >> it's easy to hear the claims and the cou